Automatic Switch Circuit Breaker: The Automatic Switch Circuit Breaker is the simplest circuit interruption device is the knife switch. By closing the switch against the action of a spring we have an automatic device in which the energy for opening the … (Read More)

Air Break Circuit Breaker: The arc interruption process of Air Break Circuit Breaker is based on the natural deionization of gases by a cooling action. The arc is resilient and can be stretched, and has resistance which can be increased both … (Read More)

Oil Circuit Breaker: Oil Circuit Breaker are extensively employed in our power systems. In these the properties of the arc are employed for arc extinction. Thus by using arc energy to crack the oil molecules, hydrogen gas may be generated which … (Read More)

Types of Arc Control Pots: There has been a continuous development in the types of arc control pots, the two basic forms of which are shown in Fig. (15.6). As the arc itself develops the pressure necessary to produce the blast … (Read More)

Multi Break Function of Circuit Breaker: It has been pointed out earlier that a circuit breaker may comprise a single pair of contacts or a number of pairs in series operating simultaneously. Undoubtedly the single-break is the simplest arrangement, a single-break … (Read More)

Air Blast Circuit Breaker: Air Blast Circuit Breaker – It is not possible to produce a low resistance arc without a considerable gas pressure so that the only type available employs a high-pressure gas blast sweeping across the contact space. The … (Read More)

Ultra High Voltage Circuit Breakers: The specific requirements demanded of a Ultra High Voltage circuit breaker by system and operator considerations are at present considered to be the following. Speed of Operation: For Ultra High Voltage systems the speed of breaker opera­tion … (Read More)

Development of Airblast Circuit Breaker: The development of Airblast circuit breakers has taken place in three stages shown schematically in Fig. (15.19): Momentarily pressurized Airblast breakers with isomaker in the Momentarily pressurized air-blast breakers with isomaker in separate pressurized chamber. Permanently pressurized air-blast breakers … (Read More)

Performance of Circuit Breaker System Requirements: Analysis of circuit interruption and the foregoing discussion of various circuit breakers apply to circuit breakers in practice if they had ideal switching characteristics. The ideal circuit Breaker System has a negligible are vol­tage and … (Read More)

Linear Resistance Damping: By introducing a linear resistance across the circuit breaker during interruption, the restriking transients are damped. Provision has to be made for subsequent interruption of the resistance circuit. Two such ways are shown in Fig. (15.27). In Fig. … (Read More)

Non Linear Resistance Shunts: Non Linear Resistance are especially suitable, both from space and reliability considerations for small shunt currents in conditions where wire-wound resistors tend to be less satisfactory on mechanical grounds. Where heavy currents are involved, there may be … (Read More)

Merits and Demerits of Types of Conventional Circuit Breakers: Having studied the operational principles, the constructional features and fields of application of the bulk oil, minimum oil and air-blast circuit breakers, it would be worthwhile to consider their relative merits and … (Read More)